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Table 2 Effectiveness of decontamination on Legionella bacterial loading

From: Legionella on board trains: effectiveness of environmental surveillance and decontamination

Month Mean of load value (CFU/l) (post-decontamination period) Mean of bacterial load in natural logarithmic numbers t p
October 2008 992.2414 6.9000 0.6591 0.2550
November 2008 583.8235 6.3696 1.1843 0.1183
December 2008 397.0000 5.9839 1.6083 0.0541
January 2009 320.1613 5.7688 1.8698 0.0309
February 2009 295.1282 5.6874 2.1259 0.0169
March 2009 306.3265 5.7247 2.3673 0.0091
April 2009 315.3801 5.7538 2.5402 0.0056
May 2009 295.0256 5.6871 2.7428 0.0031
June 2009 417.9909 6.0355 2.7060 0.0035
July 2009 498.4615 6.2115 2.6624 0.0039
August 2009 554.6850 6.3184 2.6735 0.0038
September 2009 592.1561 6.3838 2.6817 0.0037
October 2009 753.6237 6.6249 2.4677 0.0069
November 2009 752.5163 6.6234 2.5500 0.0055
December 2009 748.6751 6.6183 2.6023 0.0047
January 2010 726.0479 6.5876 2.7144 0.0034
February 2010 934.4538 6.8400 2.3195 0.0103
March 2010 962.5000 6.8695 2.3432 0.0097
April 2010 1369.3270 7.2221 1.3341 0.0912
May 2010 1314.9530 7.1816 1.4680 0.0712
June 2010 1521.4860 7.3274 1.0917 0.1376
July 2010 1482.9550 7.3018 1.1885 0.1174
August 2010 1707.7110 7.4429 0.7837 0.2167
September 2010 1697.6230 7.4370 0.8044 0.2107
October 2010 1684.2690 7.4291 0.8432 0.1996
November 2010 1635.7890 7.3999 0.9556 0.1697
December 2010 1719.8530 7.4500 0.8037 0.2109
January 2011 1721.6250 7.4510 0.8141 0.2079
  1. [In Table 2 are reported the results of the unpaired t-tests performed to compare the mean value of the bacterial load in the pre-decontamination period (grand mean: 2142.7840 CFU/L – 7.6698 in logarithmic value) with the ones of the post-decontamination period].